In 2015 roughly 85% of households had a laptop or PC[1]. iPhone's marketshare in the U.S. is roughly 40%[2].
Even if you assume that all those without a computer at home have an iPhone at home, that still means that 62.5% of iPhone users have a computer at home, and that's just unthinkable.
It should be obvious that the vast majority have iPhone users have computers at home and it's most likely was even more pronounced in 2007.
You’re comparing household statistics to individuals.
Plus, totally anecdotal, but even if every house in the 90s had a PC (and it was really more like 40% around 1997), they weren’t used anywhere remotely like the TV in the household was. Like, a couple of teenagers maybe spent all day on it, and everyone had the tech savvy aunt or uncle, but it just was nothing like today where it’s typical to see grandma and grandpa FaceTiming.
I am, but that hardly makes a difference. Assuming households residents amount are spread randomly between household with computers and households without then the ratio holds for individuals(the assumption is probably slightly off, since there is likely a correlation between poverty and having a computer and poverty and number of children, but I doubt it's very big and besides the same correlation most likely holds between poverty and having iPhones)
Remember, that old Windows XP desktop in the guest bedroom that nobody really uses anymore counts as having a PC at home, even if for all intents and purposes, it’s not used for anything except for the occasional game of Solitaire.
It should be obvious that the vast majority have iPhone users have computers at home and it's most likely was even more pronounced in 2007.
Also, broadband is irrelevant to the discussion.
[1]-https://www.census.gov/content/dam/Census/library/publicatio... [2]-https://www.macrumors.com/2017/04/20/iphone-ownership-all-ti...